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brimstone
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 Posted: Tue Jun 17, 2003 12:09 pm Post subject: logical notation |
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| I'm new with OpenOffice Math, but after using it for awhile there doesn't seem to be a way to do UNION or INTERSECTION representation over sets. Am I missing something? |
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brimstone
Guest
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| Posted: Tue Jun 17, 2003 12:12 pm Post subject: addendum |
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| To be more specific. I want to take UNION or INTERSECTION over an arbitrary number of sets. Math does offer a way to show union or intersection over 2 sets. |
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libertan
General User
Joined: 14 Apr 2003
Posts: 30
Location: Seoul, Korea
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| Posted: Tue Jun 17, 2003 4:46 pm Post subject: |
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OOo Math supports union and intersection over any arbitrary number of sets, clearly. Note that the operators(union intersection) are binary - giving a example;
| Code: |
A intersection B intersection C newline
{A intersection B} intersection C newline (same above)
A union B intersection C newline
A union B union C
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marco72r23
General User
Joined: 10 Jun 2003
Posts: 8
Location: Italy
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| Posted: Wed Jun 18, 2003 3:16 am Post subject: a solution |
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If you would like to create something like a sum operator you should
first: create a personal symbol called "yoursymbol" in the symbol dialog
then: use this code: | Code: | | oper %yoursymbol from {i=1} to n yourset_i |
I'was succesfull using new big operators and sets when I was writing a work on probability theory.
other examples could be:
| Code: | | oper %yoursymbol from {i in indexesset} yourset_i |
and you can use also a saving vertical space form:
| Code: | | oper %yoursymbol_{i in indexesset} yourset_i |
Don't forget you can use as big operators any character in your computer, but you don't need to define a personal symbol for those charcters normally accessible via keyboard.
_________________
Marco Biffino
Firenze, Italy |
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